Scale for winds in the open air (8)
I believe the answer is:
alfresco
'in the open air' is the definition.
(I've seen this before)
'scale for winds' is the wordplay.
'winds' indicates an anagram.
'scale'+'for'='scalefor'
'scalefor' is an anagram of 'ALFRESCO'.
(Other definitions for alfresco that I've seen before include "Meal eaten in the outdoors" , "Outdoors, meal perhaps" , "In the open air" , "out of the house" , "Open-air" .)